SU723732A1

SU723732A1 - Device for forced switching power-diodes of static converters

Info

Publication number: SU723732A1
Application number: SU762347973A
Authority: SU
Inventors: Владимир Семенович Руденко; Владимир Яковлевич Ромашко
Priority date: 1976-04-16
Filing date: 1976-04-16
Publication date: 1980-03-25

Description

1one

Изобретение отно ситс к преобразовательной технике, и может быть использовано дл запирани тиристоров в устройствах преобразовани и регулировани энергии, например, в автономных инверторах, регул торах посто нного тока и др.The invention relates to converter technology, and can be used to lock thyristors in energy conversion and control devices, for example, in autonomous inverters, DC regulators, etc.

Известны устройства дл принудительной коммутацаи вентилей статических преобразователей .Devices for forced switching and valves of static converters are known.

Одно из известных устройств коммутации содержит впомогательный источник импульсного коммутирующего напр жени и импульсный трансформатор, первична обмотка которого подключена к этому источнику, а вторична включена последовательно с коммутируемым вентилем и нагрузкой 1.One of the known switching devices contains an auxiliary switching voltage source and a switching transformer, the primary winding of which is connected to this source and the secondary connected in series with the switched valve and load 1.

В другом из известных устройств коммутации в качестве источника импульсного напр жени применен конденсатор, подключаемый к первичной обмотке импульсного трансформатора коммутирующим тиристором 2.In another of the known switching devices, a capacitor connected to the primary winding of the pulse transformer by a switching thyristor 2 is used as a source of pulsed voltage.

Известно устройство дл принудительной коммутации, содержащее коммутирующие конденсатор, тиристор и трансформатор, а также цепь дозар да- коммутирующего конденсатора 3.A device for forced switching is known, comprising a switching capacitor, a thyristor and a transformer, as well as a dasar and switching capacitor 3 circuit.

В таком устройстве из-за протекани во вторичной обмотке импульсного трансформатора тока силового тиристора происходит насыщение его сердечника, т. е. смещение его рабочей точки по кривой намагничивани . Дл компенсации этого смещени требуетс использование обмоток подмагничивани , что усложн ет устройство ком.мутации .In such a device, due to the flow in the secondary winding of a pulsed current transformer of a power thyristor, its core is saturated, i.e., its operating point is shifted along the magnetization curve. To compensate for this bias, the use of bias windings is required, which complicates the com-mutation device.

Цель изобретени - упрощение устройства .The purpose of the invention is to simplify the device.

Claims

The goal is achieved by the fact that in the device for forced switching of valves of static converters, containing a switching capacitor connected to a payload circuit, a switching thyristor and a pulse switching transformer on the core with a rectangular hysteresis loop, the primary winding of which is connected to the switching capacitor and thyristor , and secondary - with a power thyristor to be locked, an additional switching core is connected in series with the power thyristor sel to which the additional separation through diode connected secondary winding of said transformer. The circuit diagram of the switching device is shown in the drawing. The device for forcing the valves of the static converters is connected to the power circuit in such a way that the power thyristor 1, the switching throttle 2 and the load 3 bounded by the reverse diode 4 are connected in series. A switching circuit consisting of a charge thyristor 5, a switching capacitor 6 connected via switching thyristor 7 to the primary winding 8 of a pulse transformer 9, the secondary winding 10 of which is connected via a separation diode 11 to the choke 2, is connected to inductor 2. in a way. When unlocking the charge thyristor 5, the switching capacitor 6 is charged to some initial voltage with the polarity shown in the drawing. The core of the transformer 9 is saturated, the magnetic induction in it is equal to the residual B-fit. To lock the power thyristor 1, the switching thyristor 7 is unlocked, and the primary winding 8 of the transformer 9 is applied to the voltage of the capacitor 6. In the process of recharging the capacitor 6, the magnetic induction in the core of the transformer takes the value B + Vg. On the secondary winding 10, a voltage is applied, which is applied to the choke 2 through the separation diode 11. The voltage on the thyristor 1 then becomes negative and it is locked. The current in the thyristor decreases to zero, and the current of the choke 2 is closed through the separating diode 11 and the secondary winding 10 of the transformer 9. At the same time, a reverse magnetization reversal of the transformer core, in which magnetic induction again takes the value B - Bi, is provided. Thus, the need for a bias winding and an additional bias current source is eliminated, which simplifies the device. Since transformer 9 is removed from the power circuit, its weight and dimensions also improve. An apparatus for forcing the switching of static converter valves, comprising a switching capacitor connected to a discharged circuit, a switching thyristor and a pulse switching transformer on the core with a rectangular hysteresis loop, the primary winding of which is connected to the switching capacitor and thyristor, and the secondary winding with leads for connecting a power thyristor to be locked, characterized in that, for the sake of simplicity, it is provided with an additional com wiping the throttle, which via complement, tively isolating diode is connected parallel to the secondary winding of said transformer. Sources of information taken into account in the examination 1. Lecorgie J. Controlled electric valves and their use. M., “Energie, 1971, fig. 56, p. 14.

2. Goncharov Yu. P. and others. Autonomous inverters. Chisinau, “Stiynets, 1974, fig. 36 a, c. 92

3. Glazenko, T. A. Semiconductor converters in direct-current electric wires. L., “Energie, 1973, fig. 2 - 176, p. 68